ScrollView.java revision ac6ffce1711b84682521e6c2e55865c60929fd88
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1990f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powellimport android.os.Build; 20d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcel; 21d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcelable; 2217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2317dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 26637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 28a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganovimport android.os.Bundle; 29ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrickimport android.os.StrictMode; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 310dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengrenimport android.util.Log; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 3333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 392ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 42a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 43a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 5615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>You should never use a ScrollView with a {@link ListView}, because 5715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * ListView takes care of its own vertical scrolling. Most importantly, doing this 5815279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * defeats all of the important optimizations in ListView for dealing with 5915279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * large lists, since it effectively forces the ListView to display its entire 6015279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * list of items to fill up the infinite container supplied by ScrollView. 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 654e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 6615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>ScrollView only supports vertical scrolling. For horizontal scrolling, 6715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * use {@link HorizontalScrollView}. 68fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 69fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 760dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren private static final String TAG = "ScrollView"; 770dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 81637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 8289935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowTop; 8389935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowBottom; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 88df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell private int mLastMotionY; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 119a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1284296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1294296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1304e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 131637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 132637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 133637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 134bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 135bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 136bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 137bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 138bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 139ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 140ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick /** 14110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * Used during scrolling to retrieve the new offset within the window. 14210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 14310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private final int[] mScrollOffset = new int[2]; 14410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private final int[] mScrollConsumed = new int[2]; 145744beffb6ae76d682c559970bb634722c835a32eAdam Powell private int mNestedYOffset; 14610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 14710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 148ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * The StrictMode "critical time span" objects to catch animation 149ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * stutters. Non-null when a time-sensitive animation is 150ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * in-flight. Must call finish() on them when done animating. 151ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * These are no-ops on user builds. 152ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick */ 153ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mScrollStrictSpan = null; // aka "drag" 154ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mFlingStrictSpan = null; 155ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 156bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 157bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 158bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 159bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 160bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 162d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio private SavedState mSavedState; 163d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 172617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette public ScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 173617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette this(context, attrs, defStyleAttr, 0); 174617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette } 175617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette 176617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette public ScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 177617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette super(context, attrs, defStyleAttr, defStyleRes); 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 180617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette final TypedArray a = context.obtainStyledAttributes( 181617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette attrs, com.android.internal.R.styleable.ScrollView, defStyleAttr, defStyleRes); 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 189e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy public boolean shouldDelayChildPressedState() { 190e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy return true; 191e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy } 192e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy 193e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy @Override 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 233637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2374296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2384296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2394296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2404296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 241637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 242637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2974e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 298fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 3104e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 311fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 348ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 349ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 350ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 351ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 352ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3534e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 3549c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 3559c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy mPaddingLeft + mPaddingRight, lp.width); 356ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 357ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 358ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 359ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 3604e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 361ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 362ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3698e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3842d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4229f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 4239f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 424352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 4259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 426352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 427352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 4289f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 4299f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 4309f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4319f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4329f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4339f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 43413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 43513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 43613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 43713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 43813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 43913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 44313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 44413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 44513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 44913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 45013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 45113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 45213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 45513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 45613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 45713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 45813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 45913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 46013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 46113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 46213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 46313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4820278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell /* 4830278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell * Don't try to intercept touch if we can't scroll anyway. 4840278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell */ 4850278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell if (getScrollY() == 0 && !canScrollVertically(1)) { 4860278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell return false; 4870278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell } 4880278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell 489bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 490bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5009d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 5019d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 5029d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 5039d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 5049d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 5059d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 5069d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 5070dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (pointerIndex == -1) { 5080dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + activePointerId 5090dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren + " in onInterceptTouchEvent"); 5100dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 5110dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 5120dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 513df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(pointerIndex); 514df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 51510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (yDiff > mTouchSlop && (getNestedScrollAxes() & SCROLL_AXIS_VERTICAL) == 0) { 5169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 517f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 51813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 51913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 520744beffb6ae76d682c559970bb634722c835a32eAdam Powell mNestedYOffset = 0; 521ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan == null) { 522ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 523ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 524b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 525b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 526b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 527b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 530bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 532bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 533df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(); 5344cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 5359f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 53613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 5379f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 5389f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5399f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 540bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 541bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 542bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 543bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 5449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 545bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 54713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 54813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 5499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 5519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 555ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mIsBeingDragged && mScrollStrictSpan == null) { 556ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 557ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 558e9a16a5a3e7e41551e8c95b84d0e2af0dd130afeAdam Powell startNestedScroll(SCROLL_AXIS_VERTICAL); 5599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 560bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 566bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 56713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 568637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 569df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 570637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 571e9a16a5a3e7e41551e8c95b84d0e2af0dd130afeAdam Powell stopNestedScroll(); 572bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 573bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 574bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 5759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 58713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 58896d62aff0f97557bc15de98e145d9345288d060cAdam Powell 58996d62aff0f97557bc15de98e145d9345288d060cAdam Powell MotionEvent vtev = MotionEvent.obtain(ev); 5909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 591744beffb6ae76d682c559970bb634722c835a32eAdam Powell final int actionMasked = ev.getActionMasked(); 5929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 593744beffb6ae76d682c559970bb634722c835a32eAdam Powell if (actionMasked == MotionEvent.ACTION_DOWN) { 594744beffb6ae76d682c559970bb634722c835a32eAdam Powell mNestedYOffset = 0; 595744beffb6ae76d682c559970bb634722c835a32eAdam Powell } 596744beffb6ae76d682c559970bb634722c835a32eAdam Powell vtev.offsetLocation(0, mNestedYOffset); 597744beffb6ae76d682c559970bb634722c835a32eAdam Powell 598744beffb6ae76d682c559970bb634722c835a32eAdam Powell switch (actionMasked) { 599bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 600b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (getChildCount() == 0) { 601fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 602fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 603b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 604b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 605b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 606b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 607b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 608b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6094e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 610352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 611352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 612352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 613352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 614352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 615352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 616ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 617ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 618ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 619ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 620352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 621352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 6229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 623df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(); 624bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 62510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell startNestedScroll(SCROLL_AXIS_VERTICAL); 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 627bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 6289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 629b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 6300dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (activePointerIndex == -1) { 6310dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 6320dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 6330dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 6340dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 635b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int y = (int) ev.getY(activePointerIndex); 636b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell int deltaY = mLastMotionY - y; 63710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) { 638e9a0d6a859961bf97e9e7a0d06b2c47c7516e9b7Yorke Lee deltaY -= mScrollConsumed[1]; 63996d62aff0f97557bc15de98e145d9345288d060cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 640744beffb6ae76d682c559970bb634722c835a32eAdam Powell mNestedYOffset += mScrollOffset[1]; 64110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 642b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 643b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 644b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 645b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 646b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 647b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell mIsBeingDragged = true; 648b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (deltaY > 0) { 649b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY -= mTouchSlop; 650b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } else { 651b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY += mTouchSlop; 652b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 653b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6549f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6559f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 656e9a0d6a859961bf97e9e7a0d06b2c47c7516e9b7Yorke Lee mLastMotionY = y - mScrollOffset[1]; 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 660e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 66110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 662e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 663e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 664cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // Calling overScrollBy will call onOverScrolled, which 665cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // calls onScrollChanged if applicable. 66610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 0, range, 0, mOverscrollDistance, true) 66710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell && !hasNestedScrollingParent()) { 668637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 669637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 670637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 671637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 67210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell final int scrolledDeltaY = mScrollY - oldY; 67310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell final int unconsumedY = deltaY - scrolledDeltaY; 67410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset)) { 67510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell mLastMotionY -= mScrollOffset[1]; 67696d62aff0f97557bc15de98e145d9345288d060cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 677744beffb6ae76d682c559970bb634722c835a32eAdam Powell mNestedYOffset += mScrollOffset[1]; 67810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } else if (canOverscroll) { 679637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToY = oldY + deltaY; 680637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToY < 0) { 681c501db9f44f7967961f0ba61a0b3b63055ac1190Adam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight(), 682c501db9f44f7967961f0ba61a0b3b63055ac1190Adam Powell ev.getX(activePointerIndex) / getWidth()); 683637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 684637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onRelease(); 685637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 686637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToY > range) { 687c501db9f44f7967961f0ba61a0b3b63055ac1190Adam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight(), 688c501db9f44f7967961f0ba61a0b3b63055ac1190Adam Powell 1.f - ev.getX(activePointerIndex) / getWidth()); 689637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 690637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onRelease(); 691637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 692637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 693637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null 694637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 695df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 696637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 697637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6989f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 699bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 7004e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira case MotionEvent.ACTION_UP: 7019f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 7029f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 7039f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 704bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 7059f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 70610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 70710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell flingWithNestedDispatch(-initialVelocity); 70810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } else if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, 70910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell getScrollRange())) { 71010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell postInvalidateOnAnimation(); 71117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 713bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 714ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 716bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 717352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 718352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 719637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 720df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 721637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 722352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 723ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 724352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 725352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 7269bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 7279bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 728df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(index); 7299bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 7309bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 7319bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 732bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 733bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 734df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 735bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 73796d62aff0f97557bc15de98e145d9345288d060cAdam Powell 73896d62aff0f97557bc15de98e145d9345288d060cAdam Powell if (mVelocityTracker != null) { 73996d62aff0f97557bc15de98e145d9345288d060cAdam Powell mVelocityTracker.addMovement(vtev); 74096d62aff0f97557bc15de98e145d9345288d060cAdam Powell } 74196d62aff0f97557bc15de98e145d9345288d060cAdam Powell vtev.recycle(); 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7444e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 745bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 746bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 747bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 748bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 749bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 750bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 751bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 752bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 753bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 754df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(newPointerIndex); 755bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 756bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 757bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 758bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 759bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 760bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 7614e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 762637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 76333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 76433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 76533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 76633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 76733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 76833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 76933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (vscroll != 0) { 77033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (vscroll * getVerticalScrollFactor()); 77133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 77233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollY = mScrollY; 77333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollY = oldScrollY - delta; 77433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY < 0) { 77533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = 0; 77633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollY > range) { 77733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = range; 77833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 77933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY != oldScrollY) { 78033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(mScrollX, newScrollY); 78133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 78233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 78833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 78933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 79033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 79133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 792637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 793637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 794637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 795637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 796cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldX = mScrollX; 797cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldY = mScrollY; 798637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 799637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 8000fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 801cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette onScrollChanged(mScrollX, mScrollY, oldX, oldY); 802637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedY) { 803637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 804637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 805637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 806637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 807637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 808e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 809e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 810637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 811637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 812a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette /** @hide */ 813a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 814a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette public boolean performAccessibilityActionInternal(int action, Bundle arguments) { 815a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette if (super.performAccessibilityActionInternal(action, arguments)) { 81648d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return true; 81748d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov } 818fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 819fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 820fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 821a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov switch (action) { 822ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: 823ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov case R.id.accessibilityActionScrollDown: { 824a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 825a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.min(mScrollY + viewportHeight, getScrollRange()); 826a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 827a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 828a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 829a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 830a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 831ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: 832ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov case R.id.accessibilityActionScrollUp: { 833a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 834a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.max(mScrollY - viewportHeight, 0); 835a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 836a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 837a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 838a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 839a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 840a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 84148d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return false; 842a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 843a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov 844a7bb6fbeab933326d58aa806d8194b7b13239d34Dianne Hackborn @Override 845a7bb6fbeab933326d58aa806d8194b7b13239d34Dianne Hackborn public CharSequence getAccessibilityClassName() { 846a7bb6fbeab933326d58aa806d8194b7b13239d34Dianne Hackborn return ScrollView.class.getName(); 847a7bb6fbeab933326d58aa806d8194b7b13239d34Dianne Hackborn } 848a7bb6fbeab933326d58aa806d8194b7b13239d34Dianne Hackborn 849a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette /** @hide */ 850a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov @Override 851a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 852a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette super.onInitializeAccessibilityNodeInfoInternal(info); 853fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled()) { 854fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov final int scrollRange = getScrollRange(); 855fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (scrollRange > 0) { 856fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.setScrollable(true); 857fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY > 0) { 858ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov info.addAction( 859ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_BACKWARD); 860ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_UP); 861fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 862fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY < scrollRange) { 863ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_FORWARD); 864ac6ffce1711b84682521e6c2e55865c60929fd88Maxim Bogatov info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_DOWN); 865fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 866a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 867a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 868a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 869a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 870a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette /** @hide */ 871a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 872a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 873a54956a0bc611b1e9b3914edc7a604b59688f6b7Alan Viverette super.onInitializeAccessibilityEventInternal(event); 874d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov final boolean scrollable = getScrollRange() > 0; 875d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(scrollable); 876d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 877d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 878d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(mScrollX); 879d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(getScrollRange()); 880a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 881a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 882637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int getScrollRange() { 883637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = 0; 884637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (getChildCount() > 0) { 885637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell View child = getChildAt(0); 886637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange = Math.max(0, 887637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 888637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 889637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 890637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 891637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 10345435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 10462ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * the new visible area, the focus is reclaimed by this ScrollView.</p> 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 10492ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10742ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10957d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 1108ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1109ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 11105435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 1111ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 1112ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 1113ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 11427d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11497d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 11547d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 11793fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 11803fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 11813fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 11823fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1185f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 1186f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 1187f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 1188f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 1189f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 1190f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1191f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 1192df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 1196ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1197ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1198ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1199ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1222a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1223a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 12240b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1225a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 12260b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 12274e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1228637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getBottom(); 1229637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1230637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 1231637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollY < 0) { 1232637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollY; 1233637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollY > overscrollBottom) { 1234637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollY - overscrollBottom; 1235637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1236637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1237637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12400b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 12410b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 12420b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 12430b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1246b6824bf58a0cd34395993fa204217e8e246de6fbFilip Gruszczynski protected void measureChild(View child, int parentWidthMeasureSpec, 1247b6824bf58a0cd34395993fa204217e8e246de6fbFilip Gruszczynski int parentHeightMeasureSpec) { 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1256b6824bf58a0cd34395993fa204217e8e246de6fbFilip Gruszczynski childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 1257b6824bf58a0cd34395993fa204217e8e246de6fbFilip Gruszczynski MeasureSpec.getSize(parentHeightMeasureSpec), MeasureSpec.UNSPECIFIED); 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 1271b6824bf58a0cd34395993fa204217e8e246de6fbFilip Gruszczynski MeasureSpec.getSize(parentHeightMeasureSpec), MeasureSpec.UNSPECIFIED); 12729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 129917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1300637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1301e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1302e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1303e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1304e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1305e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1306e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, 1307637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 0, mOverflingDistance, false); 1308637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1309637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1310e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1311637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (y < 0 && oldY >= 0) { 1312637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1313637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (y > range && oldY <= range) { 1314637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1315637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 13169d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1318e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1319e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1320e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy // Keep on drawing until the animation has finished. 1321df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1322e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 1323ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } else { 1324ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1325ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1326ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1327ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 13619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 13639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 13659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1379ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 13869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 13889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 13899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 13909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 13939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 13949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 14009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 14039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 14059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 14069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 14079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 14089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 14099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 14109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1413ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 14189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 14239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 14249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 14259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 14269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 14279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 14289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 14319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 14329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 14382ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 14392ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 14402ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 14412ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 14422ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 14509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 14519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 14539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 14549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 14579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 14589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 14609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 14619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 14659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 14689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 14699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 14709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 14719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 14739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 14779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 14814e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 14859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 14869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 14879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 14889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 14899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 14919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 14959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 14969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 14979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1500ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick protected void onDetachedFromWindow() { 1501ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick super.onDetachedFromWindow(); 1502ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1503ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1504ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1505ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1506ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1507ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1508ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1509ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1510ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1511ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1512ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1513ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick @Override 15149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 15159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 15169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 15174e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira // Give a child focus if it needs it 15189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 15199c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy scrollToChild(mChildToScrollTo); 15209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 15229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15237a46dde1ae56a85fcb5cdac91173424b6355bf3cChet Haase if (!isLaidOut()) { 1524d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mSavedState != null) { 1525d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = mSavedState.scrollPosition; 1526d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = null; 1527d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } // mScrollY default value is "0" 1528d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1529d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; 1530d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int scrollRange = Math.max(0, 1531d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio childHeight - (b - t - mPaddingBottom - mPaddingTop)); 1532d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1533d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio // Don't forget to clamp 1534d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mScrollY > scrollRange) { 1535d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = scrollRange; 1536d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } else if (mScrollY < 0) { 1537d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = 0; 1538d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1539d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1540d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1541f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 15429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 15439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 15469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 15479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 15489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 15509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 15519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 15529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15537d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 15547d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 15557d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 15567d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 15579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 15589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 15599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 15609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 15619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15624e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1565f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 15669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1567e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 15689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 15699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 15709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 15739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 15744e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 15789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 158052964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 15819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 15829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1584ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1585ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1586ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 15874e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15884e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 1589637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, bottom - height), 0, height/2); 15904e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1591ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan == null) { 1592ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling"); 1593ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1594ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1595df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 15969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 159910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private void flingWithNestedDispatch(int velocityY) { 1600b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell final boolean canFling = (mScrollY > 0 || velocityY > 0) && 1601b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell (mScrollY < getScrollRange() || velocityY < 0); 16029413b245a6e5264ce4e57c48a90ee96f914476e2Adam Powell if (!dispatchNestedPreFling(0, velocityY)) { 16039413b245a6e5264ce4e57c48a90ee96f914476e2Adam Powell dispatchNestedFling(0, velocityY, canFling); 16049413b245a6e5264ce4e57c48a90ee96f914476e2Adam Powell if (canFling) { 16059413b245a6e5264ce4e57c48a90ee96f914476e2Adam Powell fling(velocityY); 16069413b245a6e5264ce4e57c48a90ee96f914476e2Adam Powell } 160710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 160810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 160910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 1610ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private void endDrag() { 1611ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mIsBeingDragged = false; 1612ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 161313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 1614ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1615ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mEdgeGlowTop != null) { 1616ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowTop.onRelease(); 1617ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowBottom.onRelease(); 1618ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1619ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1620ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1621ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1622ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1623ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1624ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1625ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 16269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 16279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 16289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 16299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 16309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 163152964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 16329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 16339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 16349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 16359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 16369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 16379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 16389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 16399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 16409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1641637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1642637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1643637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1644637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1645637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1646637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1647637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop == null) { 16484e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 164989935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowTop = new EdgeEffect(context); 165089935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowBottom = new EdgeEffect(context); 1651637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1652637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1653637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop = null; 1654637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom = null; 1655637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1656637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1657637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 166010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 166110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell return (nestedScrollAxes & SCROLL_AXIS_VERTICAL) != 0; 166210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 166310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 1664b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell @Override 1665b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell public void onNestedScrollAccepted(View child, View target, int axes) { 1666b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell super.onNestedScrollAccepted(child, target, axes); 1667b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell startNestedScroll(SCROLL_AXIS_VERTICAL); 1668b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell } 1669b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell 167010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 167110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @inheritDoc 167210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 167310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 167410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onStopNestedScroll(View target) { 167510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell super.onStopNestedScroll(target); 167610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 167710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 167810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 167910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 168010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell int dxUnconsumed, int dyUnconsumed) { 1681b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell final int oldScrollY = mScrollY; 168210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell scrollBy(0, dyUnconsumed); 1683b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell final int myConsumed = mScrollY - oldScrollY; 1684b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell final int myUnconsumed = dyUnconsumed - myConsumed; 1685b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null); 168610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 168710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 168810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 168910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @inheritDoc 169010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 169110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 1692b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 1693b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell if (!consumed) { 1694b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell flingWithNestedDispatch((int) velocityY); 1695b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell return true; 1696b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell } 1697b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell return false; 169810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 169910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 170010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 1701637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1702637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1703637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null) { 1704637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1705637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 1706637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 17077d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1708637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 17097d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(mPaddingLeft, Math.min(0, scrollY)); 1710b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowTop.setSize(width, getHeight()); 1711637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop.draw(canvas)) { 1712df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1713637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1714637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1715637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1716637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 1717637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 17187d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1719637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int height = getHeight(); 1720637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 17217d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-width + mPaddingLeft, 17227d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell Math.max(getScrollRange(), scrollY) + height); 1723637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(180, width, 0); 1724b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowBottom.setSize(width, height); 1725637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 1726df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1727637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1728637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1729637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 17309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1733e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 17349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 17359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 17369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 17379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 17389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 17399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 17409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 17419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 17429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 17439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 17449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 17459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 17469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 17479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 17489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 17499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 17509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 17519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 17539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 17549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 17559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 17569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 17579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 17589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 17599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 17619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1762d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1763d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1764d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected void onRestoreInstanceState(Parcelable state) { 176590f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell if (mContext.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.JELLY_BEAN_MR2) { 176690f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Some old apps reused IDs in ways they shouldn't have. 176790f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Don't break them, but they don't get scroll state restoration. 176890f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell super.onRestoreInstanceState(state); 176990f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell return; 177090f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell } 1771d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = (SavedState) state; 1772d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.onRestoreInstanceState(ss.getSuperState()); 1773d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = ss; 1774d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio requestLayout(); 1775d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1776d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1777d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1778d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected Parcelable onSaveInstanceState() { 177990f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell if (mContext.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.JELLY_BEAN_MR2) { 178090f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Some old apps reused IDs in ways they shouldn't have. 178190f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Don't break them, but they don't get scroll state restoration. 178290f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell return super.onSaveInstanceState(); 178390f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell } 1784d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio Parcelable superState = super.onSaveInstanceState(); 1785d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = new SavedState(superState); 1786d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio ss.scrollPosition = mScrollY; 1787d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return ss; 1788d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1789d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1790d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio static class SavedState extends BaseSavedState { 1791d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public int scrollPosition; 1792d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1793d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState(Parcelable superState) { 1794d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(superState); 1795d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1796d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1797d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState(Parcel source) { 1798d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(source); 1799d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio scrollPosition = source.readInt(); 1800d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1801d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1802d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1803d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public void writeToParcel(Parcel dest, int flags) { 1804d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.writeToParcel(dest, flags); 1805d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio dest.writeInt(scrollPosition); 1806d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1807d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1808d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1809d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public String toString() { 1810d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return "HorizontalScrollView.SavedState{" 1811d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + Integer.toHexString(System.identityHashCode(this)) 1812d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + " scrollPosition=" + scrollPosition + "}"; 1813d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1814d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1815d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public static final Parcelable.Creator<SavedState> CREATOR 1816d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio = new Parcelable.Creator<SavedState>() { 1817d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState createFromParcel(Parcel in) { 1818d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState(in); 1819d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1820d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1821d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState[] newArray(int size) { 1822d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState[size]; 1823d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1824d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio }; 1825d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1826d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 18279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1828